avoid more tuple allocations in Array constructors

(cherry picked from commit 7a05b3b) ref #18918
JuliaLang · Feb 22, 2017 · e776d78 · e776d78 · tkelman · Mar 2, 2017
1 parent c427de0
commit e776d78
Showing 1 changed file with 3 additions and 0 deletions.
diff --git a/base/boot.jl b/base/boot.jl
@@ -309,6 +309,9 @@ typealias NTuple{N,T} Tuple{Vararg{T,N}}
 # primitive array constructors
 (::Type{Array{T,N}}){T,N}(d::NTuple{N,Int}) =
     ccall(:jl_new_array, Array{T,N}, (Any,Any), Array{T,N}, d)
+(::Type{Array{T,1}}){T}(d::NTuple{1,Int}) = Array{T,1}(getfield(d,1))
+(::Type{Array{T,2}}){T}(d::NTuple{2,Int}) = Array{T,2}(getfield(d,1), getfield(d,2))
+(::Type{Array{T,3}}){T}(d::NTuple{3,Int}) = Array{T,3}(getfield(d,1), getfield(d,2), getfield(d,3))
 (::Type{Array{T,1}}){T}(m::Int) =
     ccall(:jl_alloc_array_1d, Array{T,1}, (Any,Int), Array{T,1}, m)
 (::Type{Array{T,2}}){T}(m::Int, n::Int) =